I indded found Matt's videos on indian bowies.
Anglo indian hunting knives
the guard & blade of the OP's knife, post 1, doesn't fit Matt's description.
Neither does the other bowie from the royal armoury.
Restoring an anglo indian bowie pt. 1
The scabbard on the Indian bowie has a catch much like the OP's.
I concede the OP's knife could have been made/modified in India.
Part 2.
inc. to complete the set.
I also note that many pioneer short swords, artillery short swords, and even rifle company swords (bayonets) were also made officially in India for Indian )and western) troops. I have not seen any 'bowie' style knives from India with a saw back, like on pioneer knives. Indian maybe, custom hunting knife, maybe. The short flat false edge doesn't look very bowie-ish.
I'd like to see some that do.